1091099912 has 16 divisors (see below), whose sum is σ = 2338071360. Its totient is φ = 467614224.

The previous prime is 1091099903. The next prime is 1091099939. The reversal of 1091099912 is 2199901901.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1091099912.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9741908 + ... + 9742019.

It is an arithmetic number, because the mean of its divisors is an integer number (146129460).

Almost surely, 2^1091099912 is an apocalyptic number.

It is an amenable number.

1091099912 is an abundant number, since it is smaller than the sum of its proper divisors (1246971448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091099912 is a wasteful number, since it uses less digits than its factorization.

1091099912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19483940 (or 19483936 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 41.

The square root of 1091099912 is about 33031.8015251969. The cubic root of 1091099912 is about 1029.4885172164.

The spelling of 1091099912 in words is "one billion, ninety-one million, ninety-nine thousand, nine hundred twelve".